Improved registering steam gauge



D. P. DAVIS.

Steam Gage Recorder.

MPETERS. PHOTO-LITHOGRAFHER, WAsHlNGTom D c.

Patented July 2. 1867.

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DAVID P. DAVIS, OF JERSEY CITY, NEW JERSEY.

Letters Patent No. 66,307, dated July 2, 1867.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, DAVID P. DAVIS, of Jersey City, in the county ofHudson, and State of New Jersey, have invented a new and improvedIndicator and that the following description, taken in connection withthe accompanying drawings hereinafter referred to, forms a full andexact specification of the same, wherein I have set forth the nature andprinciples of my said improvements, by which my invention maybedistinguished from all others of a similar class, together with suchparts as I claim, and desire to have secured to me by Letters Patent.

The present invention relates to an indicator more particularly intendedfor use in connection with steam boilers, although it can be applied toother purposes; and the invention consists in the application to or thecombination with any ordinarily constructed or other suitablepressure-gauge of a dial or disk of any suitable material for receivingand retaining marks or indentations, which disk is arranged to revolvewith aregular and continuous motion, and in such a manner as to bemarked by a pencil or any other suitable marking device, arranged tooperate in connection with the said pres ure-gauge, and to be thus movedaccording to the pressure thereon over the surface of the said disk,either in a straight or in a curved line, as may be found necessary.With a combination and arrangement of parts such as above described, ifthcdial or disk be properly graduated or marked off, as, for instance,divided from its centre outward in radial line, into twelve parts, toindicate the twelve hours of the day from 12 1m. to 12 midnight, and ina series of concentric circles at equal distances apart, and marked offfrom the outer to the inner, commencing with 10 and ending at 60, in theorder of tens, and then such disk be arranged to revolve once in twelvehours, and in such manner and connection with the marking device thatsaid marking device, as the pressure of steam within the boilerincreases or decreases, will move over the said revolving graduated diskin a radial line or direction thereto from its outer edge to its centre,it is plain that if the graduations of the disk and its movement inconnection with that of the marker are properly adjusted, a completediagram or record as it were of the steam pressure upon the boiler atevery portion of the twelve hours will be marked upon the graduated diskor dial, which by its graduations can be freely read and interpreted, asthey act as guides thereto. In the accompanying plate of drawings myimproved indicator is illustrated- Figure 1 being an interior view of apressure-gauge upon its rear side or back of the ordinary dial facethereto, to show arrangement of marker.

Figure 2, a partial vertical section through case to pressure-gauge andalso side elevation of same; and

Figure 3, a face view of the graduated dial or disk or what might betermed the indicator card for the pressure-gauge, but on a somewhatenlarged scale.

A, in the drawings, represents the case or box to a steam-pressuregauge, which may be of any of the ordinary forms or constructions andarrangements of parts suitable for indicating the pressure of steam persquare inch upon the boiler, through and by the means of a suitabledial-face and index-hand or pointer, as in the common steam gauges. Bthe centre or arbor for index-hand or pointer to the pressure-gauge, andC a cord secured to inner or rear end of such arbor, around or fromwhich, as it turns by the action of the steam pressure, the cord windsor unwinds as the case may be, thus causing a frame or slide, D, toraise or lower accordingly. To this frame 1) the said cord 0 isfastened, and to withdraw it as the cord unwinds, a spring, E, issuitably arranged and connected with the same therefor. This frame Dmoves in and between suitable guide-stops F, applied to the back of thepressure-gauge, and by it is carried a marker or pointer, G, that ishung or attached thereto througha spring-arm, H. This marker G projectsin a direction backward from the rear side of the dial-face. I, achamber in boxing A to gauge, back of the dial-face, in which chamber,and attached to the hinged rear side or plate J, is a watch-movement, K.It, a disk or plate connected in any proper manner by gear-wheels to thewatch-movement, so as to be turned or revolved thereby in and during thespace of twelve, twenty-four, or any other number of hours, or otherdivision of time, according as may he desired. To this plate or disk Lanother disk or card M is attached, so as to revolve therewith, and insuch a manner as to be attached and detached when so desired. This diskor card M is shown in fig. 3, and upon its face is marked off with aseries of concentric circular lines N from its outer edge towards itscentre, and at regular and equal distances apart with each circle fromthe outer edge of the disk to its centre, marked in the order of tensregularly from 10 to 60 inclusive, and with a series of radial lines atequal and regulardistances apart, dividing the said disk-face intotwenty-four equal parts, bounded by the said radial linesand the are ofthe outer edge or circle to the disk, and the are of the-innerconcentric circular line 0 embraced between said radial lines. Theseradial lines on the face of the disk L are marked at their inner endsaround the inner circular line 0; in a similar manner to the dial-faceof a watch, that is with Roman figures from I-to XII inclusive, in twoseries, one after the other, representing the twenty-four hours of theday, and suitably marked for noon, midnight, etc. The radial divisionlines of the disk or card M represent the hours of the day, and theconcentric circular lines the steam pressure, the spaces between theseveral radial lines being subdivided so as to enable the fractionalparts of an hour to be the better read or indicated. With a disk orcard, M, marked off or graduated in the manner above described, andattached to the holder L, revolved by the running of the watchmovementK, and a marker, G, connectedwith the pressure-gaugeso as to movetherewith as the steam pressure increases or decreases, by so locatingthe said card and 'the said marker that the latter will always bear uponthe former as it revolves, and so that the said marker moves over thedisk, its point of; location thereon will always be at such a markedgraduation as corresponds in number to the steam pressure within theboiler, and

as indicated by the pressure-gauge. It is plainly'obvious that by themarker the said graduated card M as it revolves will be marked in acontinuous line, but either more or less crooked according as the markeris moved.

mere or less across the face of the card by the variation of the steampressure within the boiler, a diagram or line of such a eharacterbeingrepresented in red in fig. 3, as an illustration thereof. By means of adiagram card and marker arranged together-as above described, a completeand perfect record of the steam pressure within a boiler willbe made,and one which enables the pressure at anymoment during 'the timeallotted to be ascertained, as for instance or illustration, (seefig.3,) where the card by its red line shows that at one oelock, p. m., thepressure was forty pounds; at two 0elock,p. m., between forty and fiftypounds; at three oclock, forty pounds, and so on from hour to hour. I

Having thus described my invention, I claim as new, and desire to secureby Letters Patent- The combination, with a pressure-gauge or anyequivalent therefor, of a'ma-rker of any suitable form, and revolvingdiaphragm disk or its equivalent, when all combined and arrangedtogether, substantially as and for the purpose described. 7 i

The above specification of my invention signed by me this 30th day ofMarch, 1867.

v 3 DAVID P. DAVIS.

Witnesses:

J. A. SERVICE, ALBERT W. Bnown.

